Observations

Description

Valves are linear-lanceolate, narrowing very gradually to long, protracted, rostrate apices. The raphe is lateral, becoming filiform and straight at the proximal ends. The proximal raphe ends are not expanded. The axial area is narrow and linear, expanding slightly near the central area. The stauros is narrow and rectangular. Occasionally short striae are present in the stauros. Striae along the border of the stauros are parallel, becoming radiate to more steeply radiate near the valve apices. Areolae are round to transversely oblong. Areolae are irregularly spaced near the central area and become more closely spaced toward the apices, 14-18 in 10 µm.

Although Reimer (1961) treated this taxon as a variety (S. nobilis var. baconiana), it is recognized here at the species level, as originally described (Stodder, 1859).

Original Description

Basionym: Author: Stodder 1859 Length Range: µmStriae in 10 µm:

Original Description

Original Images

Cite This Page: Bahls, L. (2011). Stauroneis baconiana. In Diatoms of the United States. Retrieved February 17, 2018, from http://westerndiatoms.colorado.edu/taxa/species/Stauroneis_baconiana

Stauroneis baconiana has transversely oblong and irregularly spaced areolae. The valves are linear-lanceolate and measure 73-139 µm long. The apices are long, protracted and rostrate. Proximal raphe ends are straight and not expanded.

Compare

Several medium to large Stauroneis species have transversely oblong, irregularly spaced areolae. Stauroneis akamina has lanceolate valves with short protracted apices.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID: 62012

Autecology Discussion

In the Northern Rockies, Stauroneis baconiana has been found in Fish Lake and Three Bears Lake in Glacier National Park and in a few ponds and small lakes in western Montana. These are all small, shallow bodies of water with abundant submerged and emergent vegetation. In these waters pH ranges from 6.1 to 8.6 and specific conductance ranges from 22 to 192 µS/cm. This taxon has also been reported from a stream and ponds in Massachusetts (Reimer 1961, Siver et al. 2005) and from Grass Pond in the Adirondak Mountains of New York State (Camburn & Charles 2000).